Paul,
I am attempting to drawing an end view of the Mazda 13B eccentric shaft,
stationary gear and rotor in AutoCad Lite to scale.

I know the eccentricity is 15mm and the radius of the rotor is 105mm but
cannot seem to get the geometry and proportions right.
I want to make a model showing the operation of the Wankel rotary which
actually duplicates the motion of the real thing but is only about 1 inch
thick and uses
clear plastic as a cover.  I have access to CNC equipment to cut the pieces
but my digital model doesn't work.
Can you help me with the geometry so I can get my drawing right and make
this work.?

I am also thinking of making a wall clock using the clock movement to drive
the eccentric shaft.  I think it would look really cool on my shop wall !

I recently un-subscribed to the list as I quickly built up emails to an
unmanageable point.  Not enough time to read them regularly.

Thank you,
Tom

Well you need the internal gears in the model and they are three to one as I recall.
Once you get the gears in the model the tips of the rotors will draw the proper
Trochoid shape for the rotor housing. You can buy small internal gears from Stock
Drive Products, Berg or Boston Gear.

Also try scaling things from this photo.

Just make a new folder in your email program and drag everything over to that.
Then when you need to know something you can search that folder using key words.
No need to read everything every day.

Paul Lamar
 
 
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